The amount of inertia of an object depends on its . The greater the , the greater its .
The greater the of the object, the greater the
required to accelerate or slow down the object.
The greater the applied, the greater the acceleration.

Aform of energy that is reflected or emitted from objects in the form of electrical and magnetic waves that can travel through space. there are many forms of  electromagnetic  energy including gamma rays, x rays, ultraviolet radiation, visible light, infrared radiation, microwaves and radio waves.